What is the difference in the pH of pure water and rain water?If it is

1.	What is the difference in the pH of pure water and rain water?If it is, so explain?
Answer» Well, let me get to your question. So, sulphur dioxide is present in the atmosphere, because of us. When there is a rainfall, the rain droplets which are basically pure H2O get combined with SO2. This leads to the formation of H2SO3. This is a pretty good acid. The colour of Taj Mahal became yellow due to this reason only. The calcium carbonate of the marble reacted with this acid and resulted to the formation of a yellow coloured compound,which got deposited on its surface. This is why the government banned all the nearby factories producing SO2 gas as their waste. Overall, due to SO2 and some other non-metallic gases, water combines with them and forms acid. This leads to decrease in pH of rainwater.

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